which is a binary database file.
is a list of domains that the
mail server accepts mail for, via ESMTP.
is a subdirectory containing one or more files. Each file in this subdirectory is plain text file, containing a list of mail domains, one per line, in lowercase. All files in the subdirectory are concatenated, and the binary database file is created from the result.
can be executed while the
mail server is running, and any changes take effect immediately. However, only one instance of
can be executed at the same time.